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I have done some research and several google searches but I have not found the answer to this question:

What is the largest finite number you can write using no more than 6 characters? Characters include numbers and operations, etc. Rules: Parenthesis do not count as characters, and letters are not allowed.

The following are some guesses that I have come up with, but I'm not confident in any of them

((((9!)!)!)!)!

((((9⁹)!)!)!)

$9^{9^{9{9}}}$

Would this be considered an OK question to ask?

Edit

I have posted the question on Math Stack Exchange. If you want to find it: here it is

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    $\begingroup$ I don't see a problem with the question, but it definitely depends what you allow as characters. See for example Knuth up arrow notation. $\endgroup$ – Matt Samuel Dec 10 '20 at 20:06
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    $\begingroup$ This question is also acceptable on Puzzling SE should you wish to post there. $\endgroup$ – TheSimpliFire Dec 10 '20 at 20:59
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  • $\begingroup$ @GerryMyerson None of those examples is my question. One of those examples is the biggest number there is, I am asking for the biggest number to be created using 6 digits and any operations. Another of your examples is asking for the biggest number created with only 1's, and the other example has slightly different rules and is asking for 10 characters. $\endgroup$ – Nai45 Dec 10 '20 at 21:58
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    $\begingroup$ I'm just going to post this question on Math Stack Exchange because no one has provided any opposition to it. $\endgroup$ – Nai45 Dec 10 '20 at 21:59
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    $\begingroup$ My first link asks for ten characters; your question asks for six. So, tomorrow, someone will post asking for the largest number with eight characters, and then the next day someone will want the largest number in eleven characters, or the largest number in four characters ... we could fill up the front page with these questions, all of them different by your logic, and never run out. Or, we could just post one question, asking for general principles that work no matter how many characters. Whatever. Look, if you do post to m.se, at the very least include a link to the ten-character question. $\endgroup$ – Gerry Myerson Dec 10 '20 at 22:52
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    $\begingroup$ And it's a little early to say "no one has provided any opposition" when your question has only been up here for a couple of hours, and probably half the world has been asleep and not checking meta. $\endgroup$ – Gerry Myerson Dec 10 '20 at 22:53
  • $\begingroup$ @GerryMyerson I see your point. Just excited to post my question though... :) $\endgroup$ – Nai45 Dec 10 '20 at 22:58